<!--
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Test for Query objects with OffscreenCanvas</title>
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
<script src="../../js/js-test-pre.js"></script>
<script src="../../js/webgl-test-utils.js"></script>
</head>
<body>
  <div id="description"></div>
  <div id="console"></div>
  <script id='myWorker' type='text/worker'>
  function tick(callback) {
      function tickImpl() {
          const res = callback();
          if (res) {
              if (requestAnimationFrame) {
                  requestAnimationFrame(tickImpl);
              } else {
                  setTimeout(tickImpl, 10);
              }
          }
      }

      tickImpl();
  }

  self.onmessage = function(e) {
      let canvas = new OffscreenCanvas(128, 128);
      let gl = canvas.getContext("webgl2");
      let query = gl.createQuery();
      gl.beginQuery(gl.ANY_SAMPLES_PASSED_CONSERVATIVE, query);
      gl.endQuery(gl.ANY_SAMPLES_PASSED_CONSERVATIVE);
      gl.clearColor(0.0, 1.0, 0.0, 1.0);
      gl.clear(gl.COLOR_BUFFER_BIT);
      tick(function() {
          const status = gl.getQueryParameter(query, gl.QUERY_RESULT_AVAILABLE);
          if (status) {
              self.postMessage("PASSED - query object completed successfully from worker");
              return false;
          } else {
              const err = gl.getError();
              if (err != 0) {
                  self.postMessage("FAILED - GL error " + err);
                  return false;
              }
          }
          return true;
      });
  };
  </script>
  <script>
    "use strict";
    description("This test ensures that query objects work with the WebGL 2.0 context created via OffscreenCanvas.");
    if (!window.OffscreenCanvas) {
        testPassed("No OffscreenCanvas support");
        finishTest();
    } else {
      var blob = new Blob([document.getElementById("myWorker").textContent]);
      var worker = new Worker(URL.createObjectURL(blob));
      worker.onmessage = function(msg) {
          if (msg.data.startsWith("PASSED")) {
              testPassed(msg.data);
          } else {
              testFailed(msg.data);
          }
          finishTest();
      }
      worker.postMessage("Start Worker");
    }
  </script>
</body>
</html>
